Myth and misconception are two completely different things. Myths are stories that usually relate some lesson important to the culture that originated the story. Until the Mythbusters try something like debunking the killing of the Hydra of Lerna by Heracles, the show’s name is based on a misconception. Maybe they could bust themselves. That could prove entertaining.
For those not familiar with the C programming language, or one of the many languages it heavily influenced, “!=” is the operator used to check for inequality. From there, it became a programmer’s shorthand for denoting things that were not equal. Or is that a misconception? It certainly isn’t a myth.